feat(toolbox): add function to show toolbox name (#12594)

Co-authored-by: Carlo Sala <carlosalag@protonmail.com>

plugins/toolbox/toolbox.plugin.zsh

@@ -2,5 +2,9 @@ function toolbox_prompt_info() {
   [[ -f /run/.toolboxenv ]] && echo "⬢"
 }
 
+function toolbox_prompt_name() {
+  [[ -f /run/.containerenv ]] && cat /run/.containerenv | awk -F\" '/name/ { print$2 }'
+}
+
 alias tbe="toolbox enter"
 alias tbr="toolbox run"